Chapter 7 Energy Use in the Copper Industry
also use diesel fuel for surface hauling of ore to the mill Approximately 155 pounds of explosives are used for every short ton of copper produced in underground The average grade of the ore mined the ratio of overlying dirt and rock overburden to the ore body stripping ratio and the depth of the pit 5Gaines supra note 3 153 below the surface rim all affect the amount and form